low's it & analytics
Bjorn Low

Bjorn Low · Freelance data scientist & software developer · NL

Custom planning & data tools, built to fit your operation.

When spreadsheets stop scaling and off-the-shelf software doesn't fit, I design and build the tool end to end: from optimization model to web interface. 5+ years of experience at Mars, ORTEC and Vion, with project work for clients such as Shell.

001 — Featured work

Two live demos you can try yourself

Real, working systems, not mockups. Both are designed, built and hosted end to end.

ChronoTag preview

ChronoTag

Live demo

Problem

Labelling time-series data is slow and inconsistent: analysts tag demand spikes, promotions and anomalies by hand, and their reasoning stays in their heads.

Approach

ChronoTag suggests labels with ML. Users confirm or adjust them in a purpose-built interface, and every decision is recorded, so the models keep improving.

Result

One central, reusable source of truth for labelled data: faster and more consistent tagging, with an audit trail of who decided what. The demo runs on realistic sales history across many SKUs.

AI/ML Data Engineering Data Labelling
SparkSched preview

SparkSched

Live demo

Problem

Scheduling cleaning crews across dozens of short-stay properties by hand takes hours every day, and still misses check-in deadlines.

Approach

SparkSched generates the day's schedule at the press of a button, using optimization that accounts for deadlines, start times, travel and agent availability.

Result

In the demo: 134 tasks across 21 agents planned within a 7.5-hour window, zero past deadline.

Operations Research Metaheuristics Scheduling

002 — What I build

Three ways I can help

Planning & scheduling optimization

Rosters, routes and plans that take hours by hand, generated in minutes, with your real-world constraints built in.

Rebuilt an Excel simulation model in Python: runs went from hours to seconds (roughly 450x faster).

Python, OR-Tools, Pyomo

Custom web applications

The tool your team actually needs, built end to end: database, logic and interface, hosted and maintained for you.

Both demos on this page are built and run this way.

FastAPI, React, TypeScript

Data pipelines & dashboards

Automated flows from your source systems to dashboards people actually check. No more copy-paste reporting.

Planning and reporting tools in daily use at Vion and Mars.

Python, SQL, Power BI

003 — Background

About

I'm Bjorn Low, a data scientist and software developer from the Netherlands. My background combines econometrics and operations research (MSc, cum laude) with five years of building production software and models at Vion, ORTEC and Mars.

I work best sitting with the people who own the problem: understand the process, agree what "better" looks like, then deliver something that runs. Small scope first, working software early. I bring my own stack and am comfortable working in yours, from AIMMS to PySpark to Power BI.

Based in
Tilburg, NL
Education
MSc Business Analytics & OR, cum laude
Experience
5+ years · Mars, ORTEC, Vion
Languages
Dutch, English
Tech stack
Python / TypeScript / React / FastAPI / PostgreSQL / Docker / CI-CD / NGINX

004 — Contact

Let's talk

Have a process that costs more time than it should? Tell me about it. A first conversation is free of charge and without obligation.